Is a product that has aha and sunscreen at the same time bad for acne prone skin?

Use sunblock. Aha can irritate your skin , especially if you are using medications for acne. You should be using sunblock(spf 30 or higher/broad spectrum coverage) but best to choose the kind that is oil free and will not clog your pores.
Depends. Choose oil free products as well as non-comedogenic products (won't cause blackheads) for acne prone skin. Also using suncreen is better than if you use a combined product when you are going to be in the sun all day.